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This reverts commit 542ee547.

CustomNonbondedForceImpl long-range correction.

the square of the number of particles in the dominant LJ type overflows
integers.

Renamed methods for dealing with TabulatedFunctions to avoid problems in wrapper APIs.  Also fixed a few bugs.

Added missing required kernel names (ApplyConstraintsKernel and VirtualSitesKernel) to check for platform capabilities, since these kernels are initialized in the next code block.

Created API and reference implementation of restricting CustomNonbondedForce to selected interaction groups

Converted the routine for identifying molecules from a recursion to a loop.  This avoids stack overflows with very long linear molecules.

Platform specific header files get installed.  This allows plugins to be built with just an OpenMM installation, not a full source tree.

Using a const Vec3& instead of three doubles for the AnisotropicBarostat API.  Still figuring out SWIG issues.